<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        p {
            /* font-size必须带单位px */
            font-size: 16px;
        }

        h1 {
            font-weight: 400;
        }

        em{
            font-style: normal;
        }

        div{
            font-style: italic;
        }
    </style>
</head>
<h1>biaoti</h1>
<p>测试字体大小</p>
<!-- font-style 清除默认倾斜效果 -->
<em>qqqqqqqqqqqqqqq</em>
<div>wqeqewqewqeqeqe</div>

<body>

</body>

</html>